How to prevent decarburization of spiral welded pipes

The service life of the spiral welded pipe is related to the surface decarburization of the spiral welded pipe. If the surface is decarburized, the strength and wear resistance of the spiral welded pipe will be reduced, which directly affects the service life of the spiral welded pipe. If the decarburization layer on the spiral welded pipe is not cleaned, the hardness and wear resistance of the surface layer of the spiral welded pipe will be reduced accordingly, and during the quenching process, the surface of the workpiece will be damaged due to changes in the volume of the inner and outer layers. Cracks form.

How to prevent the decarburization of spiral welded pipes, here are the answers:

To solve the problem of surface decarburization, the main thing is to deal with the heat treatment process, because decarburization and oxidation of the spiral welded pipe are carried out at the same time, so during the heat treatment process, the spiral welded pipe should be kept away from contact with the air as much as possible. This can improve the decarburization phenomenon.

The media that cause surface decarburization of spiral welded pipes are mainly oxidizing gases such as oxygen, water vapor, and carbon dioxide. When these gases come into contact with the heated spiral welded pipes, they will cause oxidation and decarburization of the spiral welded pipes. Therefore, it is necessary to control the carbon dioxide and carbon dioxide in the furnace. The proportion of carbon monoxide is also very important.

It is also very effective to add protective gas nitrogen into the spiral welded pipe forging furnace. Nitrogen can dispel certain oxidizing gases and reduce the decarburization of spiral welded pipes.